Wall board



July 2, 1929. H. C. RAYNEs WALL BOARD Filed Aug. 26, 1926 ai?? ze@ f/Mf@Patented July 2, `1929.

y AUNITED .STATES PATENT OFFICE.

HARRY C. RAYNES, OF PORTSMOUTH, NW HAMPSHIRE, ASSIGNOR T ATLANTICGYPSUM' PRODUCTS COMPANY, OF PORTSMOUTH, NEW HAMPSHIRE, A CORPORA- TIONOF NEW HAMPSHIRE.

WALL BOARD.

lApplication led August 26. 1926. Serial No. 131,661.

This invention relates to wall board construction, and more particularlyto an improved wall board usable for a variety of purposes' in thebuilding of dwelling houses and other structures.

This type of material has been widely manufactured and is ordinarily ofa substantially homogeneous fibrous construction somewhat similar toheavy cardboard, and as such, it

has been employed as a substitute for plaster to finish the inside ofvarious types of structures.A However, it has not been entirelysatisfactory because of its lightness whereby the walls are notsufficiently rigid, and on account of the inflammable nature of thematerial.

It has also been proposed to make a board from material more nearly theequivalent of plaster. One such material used for this purpose isgypsum. This material' is free from various defects present in theformer fibre wall boards in that it is heavier and forms a firmsubstantial wall and in that it is substantially fireproof; However,thereare certain disadvantages incident to the use of may terial of thistype, the chief 'being liability to breakage. psum andanalogoussubstances have ver littlevtensile strength and i as a result,when the board is subjected to 3o sharp shocks during handling, shippingor the like, the likelihood of breakage is relatively great. Furthermoresuch materials are difficult to use, noti-being adapted readily toreceive fastenings such as nails, screws, etc., the process of drillingholes in the sheets and of using only these drilled holes being tediousand unsatisfactory.

It has been attempted to provide a protective edge for such material toprevent 40 breakage or injury during shipment but the results attainedhave not been satisfactory.

The present invention is designed to overcome these objections andprovide a wall .board calculated not only to have all the advantages ofthe old fashioned plaster wall but also to be free from all itsdisadvantages. Objects of the present invention are to provide afireproof wall board which is of such durable construction that it willnot be damaged in the handling' incident to sending it from the factoryto the point of use, to pro- -the same time to provide `a board whichmay p be attached to the usual vstudding l y nails, screws or otherfastening means without the possibility of injury by cracking. Otherob-. jects and -advantages of the present construction will vb eapparent as the description proceeds and Will be particularly pointedout in the appended claims.

Referring to the drawings in which is shown one embodiment of theinvention,

Fig. l is a plan View of a board construoted in accordance with thisinvention having a part of the covering paper broker away to show theinterior construction; and

y Fig. 2 is a section on the line 2-2,of Fig. l,

The board comprises a body portion 1 7o which may be of gypsum or somelight cementitious orfrangible material. One or more of the edges of thebody are provided with Aa strip 2 of fibrous material as, Afor example,

cellulose or animal fibres or any combination thereof. This fibrousmarginal portion may be treated in anysuitable or desired manner torender the boardfireproof or to effect fire-resistant qualities, as forexample, by impregnating the fibres with gypsum or other desiredmaterial which may be done in .any conventional manner. It may at timesbe desirable to at least partially impregnate the marginal strip withsome of' the material of` which the body portion is made, which may bedone through contact with the core or body portion before the setting ofthe latter' as shown at 5, resulting in a certain limited binding actionbetween the vmaterial impregnating the fibrous marginal portion and thematerial composing the body portion.

lhe body portion and marginal portion are preferably covered on one orboth sides with the usual thick paper shown at 3 and 4, which paper hasthe effect ofserving as an additional binder between said portions.

The corners of the board may be made as shown in Fig, 1 with the end ofone marginal reinforcement abutting the ,adjacent side of the adjoiningreinforcement, or, if desired, the marginal reinforcements may bebeveled so that they abut each other onA a line inclined to thesides ofthe board. In construct.- ing the board, it is preferable first tocombine a fibrous edge with the gypsum core or body portion, makingthewhole somewhat wider `than the desired finished width of the board, thento apply the covering papers 3 ding, and will serve also as a protectingedge for the gypsum body portions during the shipping or handling of theboard, thus preventing the cracking of the cementitious body portion. l

While I have described the board as having a gypsum body portion, Iintend thismerely as illustrative of the type of `material which maymany other specific materials and mixtures might be substitutedtherefor. I do not Wish to be limited, therefore, except by the scope ofthe appendedwzlaims. y Y

I claim:

1. A Wall board comprising a body portion of light cementitiousmaterial, a marginal portion of loose fibrous material partially bondedwith the cementitious material, said marginal portion being impregnatedWith some ofthe material of which the body por- -tion is Vmade to bindsaid portions together,

and a covering portionl of fibrous sheet material extending over boththe body portion loose fibrous be used and not as limiting it, as

1,7 1eme and the marginal portion, whereby to bind said portions morefirmly together.

2. A Wall board comprising a body portion of gypsum, Widthextendingabout at leasta part of its periphery, said marginal lportionbeing of material and rendered ireproof byv impregnating With gypsumwhich serves also to bindit to the body portion, and covery,4o ingportions of heavy paper on either side off the board to bind theportions together more irmly and topresent a smooth inished surace. v Y

v 3.' A Wall board comprising a body portion of hardened plasticmaterial, a peripheral portion of substantial Width extending entirely.about the perimeter of the body portion, and a cover sheet overlappingeach face of said body and peripheral portion, each cover sheet beingformed of librous material and being adhesively secured to a flat faceof said .peripheral portion, said peripheral portion being of loosefibrous material and joined to the body portion by a part of thematerial 5. of the body portiony impregnating the adjoining part of theperipheral portion to provide a bond between said portions.

Signed by me at Portsmouth, New Hampshire this twenty-third day of July,1926.

HARRY o. RAYNns.

a marginal portion of substantial

